resolve sync warnings

This resolves issue #180 (warnings about attempts to multiply add models to syncing set)

When imports are resolved via different naming, they are not cached.

Probably something to cleanup across KA Lite before the next release, and to look at some standardized imports such as using the [\__future__ module](http://docs.python.org/2/library/__future__.html), which is used by Django to deal a bit more smoothly with imports.